require 'abstract_unit' class SanitizerTest < ActionController::TestCase def setup @sanitizer = nil # used by assert_sanitizer end def test_strip_tags sanitizer = HTML::FullSanitizer.new assert_equal("<<")) assert_equal("Dont touch me", sanitizer.sanitize("Dont touch me")) assert_equal("This is a test.", sanitizer.sanitize("

This is a test.

")) assert_equal("Weirdos", sanitizer.sanitize("Wei<a onclick='alert(document.cookie);'/>rdos")) assert_equal("This is a test.", sanitizer.sanitize("This is a test.")) assert_equal( %{This is a test.\n\n\nIt no longer contains any HTML.\n}, sanitizer.sanitize( %{This is <b>a <a href="" target="_blank">test</a></b>.\n\n\n\n

It no longer contains any HTML.

\n})) assert_equal "This has a here.", sanitizer.sanitize("This has a here.") assert_equal "This has a here.", sanitizer.sanitize("This has a ]]> here.") assert_equal "This has an unclosed ", sanitizer.sanitize("This has an unclosed ]] here...") [nil, '', ' '].each { |blank| assert_equal blank, sanitizer.sanitize(blank) } end def test_strip_links sanitizer = HTML::LinkSanitizer.new assert_equal "Dont touch me", sanitizer.sanitize("Dont touch me") assert_equal "on my mind\nall day long", sanitizer.sanitize("on my mind\nall day long") assert_equal "0wn3d", sanitizer.sanitize("0wn3d") assert_equal "Magic", sanitizer.sanitize("Magic") assert_equal "FrrFox", sanitizer.sanitize("FrrFox") assert_equal "My mind\nall day long", sanitizer.sanitize("My mind\nall day long") assert_equal "all day long", sanitizer.sanitize("<a href='hello'>all day long</a>") assert_equal "", '' end def test_sanitize_plaintext raw = "<span>foo</span></plaintext>" assert_sanitized raw, "<span>foo</span>" end def test_sanitize_script assert_sanitized "a b c<script language=\"Javascript\">blah blah blah</script>d e f", "a b cd e f" end # TODO: Clean up def test_sanitize_js_handlers raw = %{onthis="do that" <a href="#" onclick="hello" name="foo" onbogus="remove me">hello</a>} assert_sanitized raw, %{onthis="do that" <a name="foo" href="#">hello</a>} end def test_sanitize_javascript_href raw = %{href="javascript:bang" <a href="javascript:bang" name="hello">foo</a>, <span href="javascript:bang">bar</span>} assert_sanitized raw, %{href="javascript:bang" <a name="hello">foo</a>, <span>bar</span>} end def test_sanitize_image_src raw = %{src="javascript:bang" <img src="javascript:bang" width="5">foo</img>, <span src="javascript:bang">bar</span>} assert_sanitized raw, %{src="javascript:bang" <img width="5">foo</img>, <span>bar</span>} end HTML::WhiteListSanitizer.allowed_tags.each do |tag_name| define_method "test_should_allow_#{tag_name}_tag" do assert_sanitized "start <#{tag_name} title=\"1\" onclick=\"foo\">foo <bad>bar</bad> baz</#{tag_name}> end", %(start <#{tag_name} title="1">foo bar baz</#{tag_name}> end) end end def test_should_allow_anchors assert_sanitized %(<a href="foo" onclick="bar"><script>baz</script></a>), %(<a href="foo"></a>) end # RFC 3986, sec 4.2 def test_allow_colons_in_path_component assert_sanitized("<a href=\"./this:that\">foo</a>") end %w(src width height alt).each do |img_attr| define_method "test_should_allow_image_#{img_attr}_attribute" do assert_sanitized %(<img #{img_attr}="foo" onclick="bar" />), %(<img #{img_attr}="foo" />) end end def test_should_handle_non_html assert_sanitized 'abc' end def test_should_handle_blank_text assert_sanitized nil assert_sanitized '' end def test_should_allow_custom_tags text = "<u>foo</u>" sanitizer = HTML::WhiteListSanitizer.new assert_equal(text, sanitizer.sanitize(text, :tags => %w(u))) end def test_should_allow_only_custom_tags text = "<u>foo</u> with <i>bar</i>" sanitizer = HTML::WhiteListSanitizer.new assert_equal("<u>foo</u> with bar", sanitizer.sanitize(text, :tags => %w(u))) end def test_should_allow_custom_tags_with_attributes text = %(<blockquote cite="http://example.com/">foo</blockquote>) sanitizer = HTML::WhiteListSanitizer.new assert_equal(text, sanitizer.sanitize(text)) end def test_should_allow_custom_tags_with_custom_attributes text = %(<blockquote foo="bar">Lorem ipsum</blockquote>) sanitizer = HTML::WhiteListSanitizer.new assert_equal(text, sanitizer.sanitize(text, :attributes => ['foo'])) end [%w(img src), %w(a href)].each do |(tag, attr)| define_method "test_should_strip_#{attr}_attribute_in_#{tag}_with_bad_protocols" do assert_sanitized %(<#{tag} #{attr}="javascript:bang" title="1">boo</#{tag}>), %(<#{tag} title="1">boo</#{tag}>) end end def test_should_flag_bad_protocols sanitizer = HTML::WhiteListSanitizer.new %w(about chrome data disk hcp help javascript livescript lynxcgi lynxexec ms-help ms-its mhtml mocha opera res resource shell vbscript view-source vnd.ms.radio wysiwyg).each do |proto| assert sanitizer.send(:contains_bad_protocols?, 'src', "#{proto}://bad") end end def test_should_accept_good_protocols_ignoring_case sanitizer = HTML::WhiteListSanitizer.new HTML::WhiteListSanitizer.allowed_protocols.each do |proto| assert !sanitizer.send(:contains_bad_protocols?, 'src', "#{proto.capitalize}://good") end end def test_should_accept_good_protocols sanitizer = HTML::WhiteListSanitizer.new HTML::WhiteListSanitizer.allowed_protocols.each do |proto| assert !sanitizer.send(:contains_bad_protocols?, 'src', "#{proto}://good") end end def test_should_reject_hex_codes_in_protocol assert_sanitized %(<a href="&#37;6A&#37;61&#37;76&#37;61&#37;73&#37;63&#37;72&#37;69&#37;70&#37;74&#37;3A&#37;61&#37;6C&#37;65&#37;72&#37;74&#37;28&#37;22&#37;58&#37;53&#37;53&#37;22&#37;29">1</a>), "<a>1</a>" assert @sanitizer.send(:contains_bad_protocols?, 'src', "%6A%61%76%61%73%63%72%69%70%74%3A%61%6C%65%72%74%28%22%58%53%53%22%29") end def test_should_block_script_tag assert_sanitized %(<SCRIPT\nSRC=http://ha.ckers.org/xss.js></SCRIPT>), "" end [%(<IMG SRC="javascript:alert('XSS');">), %(<IMG SRC=javascript:alert('XSS')>), %(<IMG SRC=JaVaScRiPt:alert('XSS')>), %(<IMG """><SCRIPT>alert("XSS")</SCRIPT>">), %(<IMG SRC=javascript:alert(&quot;XSS&quot;)>), %(<IMG SRC=javascript:alert(String.fromCharCode(88,83,83))>), %(<IMG SRC=&#106;&#97;&#118;&#97;&#115;&#99;&#114;&#105;&#112;&#116;&#58;&#97;&#108;&#101;&#114;&#116;&#40;&#39;&#88;&#83;&#83;&#39;&#41;>), %(<IMG SRC=&#0000106&#0000097&#0000118&#0000097&#0000115&#0000099&#0000114&#0000105&#0000112&#0000116&#0000058&#0000097&#0000108&#0000101&#0000114&#0000116&#0000040&#0000039&#0000088&#0000083&#0000083&#0000039&#0000041>), %(<IMG SRC=&#x6A&#x61&#x76&#x61&#x73&#x63&#x72&#x69&#x70&#x74&#x3A&#x61&#x6C&#x65&#x72&#x74&#x28&#x27&#x58&#x53&#x53&#x27&#x29>), %(<IMG SRC="jav\tascript:alert('XSS');">), %(<IMG SRC="jav&#x09;ascript:alert('XSS');">), %(<IMG SRC="jav&#x0A;ascript:alert('XSS');">), %(<IMG SRC="jav&#x0D;ascript:alert('XSS');">), %(<IMG SRC=" &#14; javascript:alert('XSS');">), %(<IMG SRC=`javascript:alert("RSnake says, 'XSS'")`>)].each_with_index do |img_hack, i| define_method "test_should_not_fall_for_xss_image_hack_#{i+1}" do assert_sanitized img_hack, "<img>" end end def test_should_sanitize_tag_broken_up_by_null assert_sanitized %(<SCR\0IPT>alert(\"XSS\")</SCR\0IPT>), "alert(\"XSS\")" end def test_should_sanitize_invalid_script_tag assert_sanitized %(<SCRIPT/XSS SRC="http://ha.ckers.org/xss.js"></SCRIPT>), "" end def test_should_sanitize_script_tag_with_multiple_open_brackets assert_sanitized %(<<SCRIPT>alert("XSS");//<</SCRIPT>), "&lt;" assert_sanitized %(<iframe src=http://ha.ckers.org/scriptlet.html\n<a), %(&lt;a) end def test_should_sanitize_unclosed_script assert_sanitized %(<SCRIPT SRC=http://ha.ckers.org/xss.js?<B>), "<b>" end def test_should_sanitize_half_open_scripts assert_sanitized %(<IMG SRC="javascript:alert('XSS')"), "<img>" end def test_should_not_fall_for_ridiculous_hack img_hack = %(<IMG\nSRC\n=\n"\nj\na\nv\na\ns\nc\nr\ni\np\nt\n:\na\nl\ne\nr\nt\n(\n'\nX\nS\nS\n'\n)\n"\n>) assert_sanitized img_hack, "<img>" end # TODO: Clean up def test_should_sanitize_attributes assert_sanitized %(<SPAN title="'><script>alert()</script>">blah</SPAN>), %(<span title="'&gt;&lt;script&gt;alert()&lt;/script&gt;">blah</span>) end def test_should_sanitize_illegal_style_properties raw = %(display:block; position:absolute; left:0; top:0; width:100%; height:100%; z-index:1; background-color:black; background-image:url(http://www.ragingplatypus.com/i/cam-full.jpg); background-x:center; background-y:center; background-repeat:repeat;) expected = %(display: block; width: 100%; height: 100%; background-color: black; background-image: ; background-x: center; background-y: center;) assert_equal expected, sanitize_css(raw) end def test_should_sanitize_with_trailing_space raw = "display:block; " expected = "display: block;" assert_equal expected, sanitize_css(raw) end def test_should_sanitize_xul_style_attributes raw = %(-moz-binding:url('http://ha.ckers.org/xssmoz.xml#xss')) assert_equal '', sanitize_css(raw) end def test_should_sanitize_invalid_tag_names assert_sanitized(%(a b c<script/XSS src="http://ha.ckers.org/xss.js"></script>d e f), "a b cd e f") end def test_should_sanitize_non_alpha_and_non_digit_characters_in_tags assert_sanitized('<a onclick!#$%&()*~+-_.,:;?@[/|\]^`=alert("XSS")>foo</a>', "<a>foo</a>") end def test_should_sanitize_invalid_tag_names_in_single_tags assert_sanitized('<img/src="http://ha.ckers.org/xss.js"/>', "<img />") end def test_should_sanitize_img_dynsrc_lowsrc assert_sanitized(%(<img lowsrc="javascript:alert('XSS')" />), "<img />") end def test_should_sanitize_div_background_image_unicode_encoded raw = %(background-image:\0075\0072\006C\0028'\006a\0061\0076\0061\0073\0063\0072\0069\0070\0074\003a\0061\006c\0065\0072\0074\0028.1027\0058.1053\0053\0027\0029'\0029) assert_equal '', sanitize_css(raw) end def test_should_sanitize_div_style_expression raw = %(width: expression(alert('XSS'));) assert_equal '', sanitize_css(raw) end def test_should_sanitize_img_vbscript assert_sanitized %(<img src='vbscript:msgbox("XSS")' />), '<img />' end def test_should_sanitize_cdata_section assert_sanitized "<![CDATA[<span>section</span>]]>", "&lt;![CDATA[&lt;span>section&lt;/span>]]>" end def test_should_sanitize_unterminated_cdata_section assert_sanitized "<![CDATA[<span>neverending...", "&lt;![CDATA[&lt;span>neverending...]]>" end def test_should_not_mangle_urls_with_ampersand assert_sanitized %{<a href=\"http://www.domain.com?var1=1&amp;var2=2\">my link</a>} end def test_should_sanitize_neverending_attribute assert_sanitized "<span class=\"\\", "<span class=\"\\\">" end protected def assert_sanitized(input, expected = nil) @sanitizer ||= HTML::WhiteListSanitizer.new if input assert_dom_equal expected || input, @sanitizer.sanitize(input) else assert_nil @sanitizer.sanitize(input) end end def sanitize_css(input) (@sanitizer ||= HTML::WhiteListSanitizer.new).sanitize_css(input) end end